The best fits to the individual line profiles obtained with CASSIS are superimposed in red on the spectra in Figs. REF –REF . The error bars on \(T_{\mathrm {rot}}\)  and \(N\)  were estimated from LTE fits to the line profiles taking into account the absolute flux calibration uncertainties (see Sect. 3.3) and the statistical rms noise.
Our column density determinations for HCN and HNC towards L1157-mm and L1157-B1 are in good agreement with those of [1]}.
Recently, [2]} observed the H\(^{13}\) CN and HC\(^{15}\) N \(J\) =1–0 line emission at 4 resolution toward L1157-B1 using NOEMA, as part
of the Large Program SOLIS. Their radiative transfer modelling of both lines yielded \(N\) (H\(^{13}\) CN) \(\sim 7\times 10^{12}\hbox{\hspace{1.99997pt}cm$^{-2}$}\)  and \(N\) (HC\(^{15}\) N) \(\sim 2 \times 10^{12}\hbox{\hspace{1.99997pt}cm$^{-2}$}\) . Our observational determinations are in satisfying agreement with these values (see Table REF ).
